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    <li><a href="#打印日志">打印日志</a></li>
    <li><a href="#常量与变量">常量与变量</a></li>
    <li><a href="#null声明">null声明</a></li>
    <li><a href="#空判断">空判断</a></li>
    <li><a href="#字符串拼接">字符串拼接</a></li>
    <li><a href="#换行">换行</a></li>
    <li><a href="#三元表达式">三元表达式</a></li>
    <li><a href="#操作符">操作符</a></li>
    <li><a href="#类型判断和转换-声明式">类型判断和转换 (声明式)</a></li>
    <li><a href="#类型判断和转换-隐式">类型判断和转换 (隐式)</a></li>
    <li><a href="#多重条件">多重条件</a></li>
    <li><a href="#更灵活的case语句">更灵活的case语句</a></li>
    <li><a href="#for循环">for循环</a></li>
    <li><a href="#更方便的集合操作">更方便的集合操作</a></li>
    <li><a href="#遍历">遍历</a></li>
    <li><a href="#方法定义">方法定义</a></li>
    <li><a href="#带返回值的方法">带返回值的方法</a></li>
    <li><a href="#无结束符号">无结束符号</a></li>
    <li><a href="#constructor-构造器">constructor 构造器</a></li>
    <li><a href="#get-set-构造器">Get Set 构造器</a></li>
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    <article class="post">
        <header>
            <h1 class="post-title">Kotlin与Java比较</h1>
        </header>
        <date class="post-meta meta-date">
            2021年8月26日
        </date>
        
        <div class="post-meta">
            <span>|</span>
            
            <span class="meta-category"><a href='/categories/Kotlin'>Kotlin</a></span>
            
        </div>
        
        
        <div class="post-meta">
            <span id="busuanzi_container_page_pv">|<span id="busuanzi_value_page_pv"></span><span>
                    阅读</span></span>
        </div>
        
        
        <div class="post-content">
            <blockquote>
<p>本文主要介绍java与kotlin的一些异同</p>
</blockquote>
<p>后面可能还会继续比较kotlin和dart 期待吗？</p>
<h2 id="打印日志">打印日志</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>System.out.print(&quot;Amit Shekhar&quot;);
System.out.println(&quot;Amit Shekhar&quot;);
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>print(&quot;Amit Shekhar&quot;)
println(&quot;Amit Shekhar&quot;)
</code></pre><hr>
<h2 id="常量与变量">常量与变量</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>String name = &quot;Amit Shekhar&quot;;
final String name = &quot;Amit Shekhar&quot;;
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>var name = &quot;Amit Shekhar&quot;
val name = &quot;Amit Shekhar&quot;
</code></pre><hr>
<h2 id="null声明">null声明</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>String otherName;
otherName = null;
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>var otherName : String?
otherName = null
</code></pre><hr>
<h2 id="空判断">空判断</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>if (text != null) {
    int length = text.length();
}
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>text?.let {
    val length = text.length
}
// or simply
val length = text?.length
</code></pre><hr>
<h2 id="字符串拼接">字符串拼接</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>String firstName = &quot;Amit&quot;;
String lastName = &quot;Shekhar&quot;;
String message = &quot;My name is: &quot; + firstName + &quot; &quot; + lastName;
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>val firstName = &quot;Amit&quot;
val lastName = &quot;Shekhar&quot;
val message = &quot;My name is: $firstName $lastName&quot;
</code></pre><hr>
<h2 id="换行">换行</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>String text = &quot;First Line\n&quot; +
              &quot;Second Line\n&quot; +
              &quot;Third Line&quot;;
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>val text = &quot;&quot;&quot;
        |First Line
        |Second Line
        |Third Line
        &quot;&quot;&quot;.trimMargin()
</code></pre><hr>
<h2 id="三元表达式">三元表达式</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>String text = x &gt; 5 ? &quot;x &gt; 5&quot; : &quot;x &lt;= 5&quot;;
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>val text = if (x &gt; 5)
              &quot;x &gt; 5&quot;
           else &quot;x &lt;= 5&quot;
</code></pre><hr>
<h2 id="操作符">操作符</h2>
<ul>
<li>java</li>
</ul>
<pre><code>final int andResult  = a &amp; b;
final int orResult   = a | b;
final int xorResult  = a ^ b;
final int rightShift = a &gt;&gt; 2;
final int leftShift  = a &lt;&lt; 2;
final int unsignedRightShift = a &gt;&gt;&gt; 2;
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>val andResult  = a and b
val orResult   = a or b
val xorResult  = a xor b
val rightShift = a shr 2
val leftShift  = a shl 2
val unsignedRightShift = a ushr 2
</code></pre><hr>
<h2 id="类型判断和转换-声明式">类型判断和转换 (声明式)</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>if (object instanceof Car) {
}
Car car = (Car) object;
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>if (object is Car) {
}
var car = object as Car
</code></pre><hr>
<h2 id="类型判断和转换-隐式">类型判断和转换 (隐式)</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>if (object instanceof Car) {
   Car car = (Car) object;
}
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>if (object is Car) {
   var car = object // 聪明的转换
}
</code></pre><hr>
<h2 id="多重条件">多重条件</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>if (score &gt;= 0 &amp;&amp; score &lt;= 300) { }
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>if (score in 0..300) { }
</code></pre><hr>
<h2 id="更灵活的case语句">更灵活的case语句</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>int score = // some score;
String grade;
switch (score) {
    case 10:
    case 9:
        grade = &quot;Excellent&quot;;
        break;
    case 8:
    case 7:
    case 6:
        grade = &quot;Good&quot;;
        break;
    case 5:
    case 4:
        grade = &quot;OK&quot;;
        break;
    case 3:
    case 2:
    case 1:
        grade = &quot;Fail&quot;;
        break;
    default:
        grade = &quot;Fail&quot;;
}
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>var score = // some score
var grade = when (score) {
    9, 10 -&gt; &quot;Excellent&quot;
    in 6..8 -&gt; &quot;Good&quot;
    4, 5 -&gt; &quot;OK&quot;
    in 1..3 -&gt; &quot;Fail&quot;
    else -&gt; &quot;Fail&quot;
}
</code></pre><hr>
<h2 id="for循环">for循环</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>for (int i = 1; i &lt;= 10 ; i++) { }

for (int i = 1; i &lt; 10 ; i++) { }

for (int i = 10; i &gt;= 0 ; i--) { }

for (int i = 1; i &lt;= 10 ; i+=2) { }

for (int i = 10; i &gt;= 0 ; i-=2) { }

for (String item : collection) { }

for (Map.Entry&lt;String, String&gt; entry: map.entrySet()) { }
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>for (i in 1..10) { }

for (i in 1 until 10) { }

for (i in 10 downTo 0) { }

for (i in 1..10 step 2) { }

for (i in 10 downTo 0 step 2) { }

for (item in collection) { }

for ((key, value) in map) { }
</code></pre><hr>
<h2 id="更方便的集合操作">更方便的集合操作</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>final List&lt;Integer&gt; listOfNumber = Arrays.asList(1, 2, 3, 4);

final Map&lt;Integer, String&gt; keyValue = new HashMap&lt;Integer, String&gt;();
map.put(1, &quot;Amit&quot;);
map.put(2, &quot;Ali&quot;);
map.put(3, &quot;Mindorks&quot;);

// Java 9
final List&lt;Integer&gt; listOfNumber = List.of(1, 2, 3, 4);

final Map&lt;Integer, String&gt; keyValue = Map.of(1, &quot;Amit&quot;,
                                             2, &quot;Ali&quot;,
                                             3, &quot;Mindorks&quot;);
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>val listOfNumber = listOf(1, 2, 3, 4)
val keyValue = mapOf(1 to &quot;Amit&quot;,
                     2 to &quot;Ali&quot;,
                     3 to &quot;Mindorks&quot;)
</code></pre><hr>
<h2 id="遍历">遍历</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>// Java 7 and below
for (Car car : cars) {
  System.out.println(car.speed);
}

// Java 8+
cars.forEach(car -&gt; System.out.println(car.speed));

// Java 7 and below
for (Car car : cars) {
  if (car.speed &gt; 100) {
    System.out.println(car.speed);
  }
}

// Java 8+
cars.stream().filter(car -&gt; car.speed &gt; 100).forEach(car -&gt; System.out.println(car.speed));
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>cars.forEach {
    println(it.speed)
}

cars.filter { it.speed &gt; 100 }
      .forEach { println(it.speed)}
</code></pre><hr>
<h2 id="方法定义">方法定义</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>void doSomething() {
   // logic here
}

void doSomething(int... numbers) {
   // logic here
}
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>fun doSomething() {
   // logic here
}

fun doSomething(vararg numbers: Int) {
   // logic here
}
</code></pre><hr>
<h2 id="带返回值的方法">带返回值的方法</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>int getScore() {
   // logic here
   return score;
}
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>fun getScore(): Int {
   // logic here
   return score
}

// as a single-expression function

fun getScore(): Int = score
</code></pre><hr>
<h2 id="无结束符号">无结束符号</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>int getScore(int value) {
    // logic here
    return 2 * value;
}
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>fun getScore(value: Int): Int {
   // logic here
   return 2 * value
}

// as a single-expression function

fun getScore(value: Int): Int = 2 * value
</code></pre><hr>
<h2 id="constructor-构造器">constructor 构造器</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>public class Utils {

    private Utils() { 
      // This utility class is not publicly instantiable 
    }
    
    public static int getScore(int value) {
        return 2 * value;
    }
    
}
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>class Utils private constructor() {

    companion object {
    
        fun getScore(value: Int): Int {
            return 2 * value
        }
        
    }
}

// another way

object Utils {

    fun getScore(value: Int): Int {
        return 2 * value
    }

}
</code></pre><hr>
<h2 id="get-set-构造器">Get Set 构造器</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>public class Developer {

    private String name;
    private int age;

    public Developer(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Developer developer = (Developer) o;

        if (age != developer.age) return false;
        return name != null ? name.equals(developer.name) : developer.name == null;

    }

    @Override
    public int hashCode() {
        int result = name != null ? name.hashCode() : 0;
        result = 31 * result + age;
        return result;
    }

    @Override
    public String toString() {
        return &quot;Developer{&quot; +
                &quot;name='&quot; + name + '\'' +
                &quot;, age=&quot; + age +
                '}';
    }
}
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>data class Developer(val name: String, val age: Int)
</code></pre><hr>
<h2 id="原型扩展">原型扩展</h2>
<ul>
<li>Java</li>
</ul>
<pre><code>public class Utils {

    private Utils() { 
      // This utility class is not publicly instantiable 
    }
    
    public static int triple(int value) {
        return 3 * value;
    }
    
}

int result = Utils.triple(3);
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>fun Int.triple(): Int {
  return this * 3
}

var result = 3.triple()
</code></pre><ul>
<li>Java</li>
</ul>
<pre><code>public enum Direction {
        NORTH(1),
        SOUTH(2),
        WEST(3),
        EAST(4);

        int direction;

        Direction(int direction) {
            this.direction = direction;
        }

        public int getDirection() {
            return direction;
        }
    }
</code></pre><ul>
<li>Kotlin</li>
</ul>
<pre><code>enum class Direction(val direction: Int) {
    NORTH(1),
    SOUTH(2),
    WEST(3),
    EAST(4);
}
</code></pre><p>完结撒花</p>

        </div>

        
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        <li><strong>原文作者：</strong><a rel="author" href="https://luckly.work/">luckly</a></li>
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        <li><strong>版权声明：</strong>本作品采用<a rel="license" href="https://creativecommons.org/licenses/by-nc-nd/4.0/">知识共享署名-非商业性使用-禁止演绎 4.0 国际许可协议</a>进行许可，非商业转载请注明出处（作者，原文链接），商业转载请联系作者获得授权。</li>
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    <h2>See Also</h2>
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